There may be a few showers when fireworks go off at Ala Moana Beach Park Monday night.

The National Weather Service is calling for a 50 percent chance of rain with mostly cloudy skies and scattered showers for Honolulu and south shores of Oahu on the Fourth of July.

“We can’t promise complete dryness,” said Jeff Powell, a meteorologist with the Honolulu office of the National Weather Service. The rains shouldn’t be heavy, he said.

Lows will be between 70 and 77 degrees.

Those spending the day at the park can expect partly sunny skies with scattered showers.

Winds will be breezy between 10 to 20 mph.

The National Weather Service said the tradewinds are occasionally blowing clouds and shower from the windward side of the island to leeward areas.

Skies are likely to be clearest during the middle of the day, with clouds and showers becoming more frequent at night.

Meanwhile, a high surf advisory for the east shores of all islands has been extended until at least 6 a.m. Monday.

The National Weather Service said waves of 5 to 8 feet are being generated by strong and gusty tradewinds.

The surf and accompanying currents make swimming difficult and dangerous, the weather service said.

The advisory had been set to expire at 6 p.m. today.